diff --git a/js/src/jsarray.cpp b/js/src/jsarray.cpp
index 875a922a732..67a2c7a9350 100644
--- a/js/src/jsarray.cpp
+++ b/js/src/jsarray.cpp
@@ -2436,7 +2436,6 @@ mjit::stubs::ArrayShift(VMFrame &f)
 {
     JSObject *obj = &f.regs.sp[-1].toObject();
     JS_ASSERT(obj->isDenseArray());
-    JS_ASSERT(!js_PrototypeHasIndexedProperties(f.cx, obj));
 
     /*
      * At this point the length and initialized length have already been